Suction cup



FIG. 1 is a top plan view of a suction cup showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a side elevational view thereof, the side opposite being a mirror image;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a bottom plan view thereof; and,

FIG. 6 is a perspective view thereof taken from one side and from above. 

The ornamental design for suction cup, as shown. 